Question

嗨我试图实现共享偏好，我尝试的一切似乎都不起作用。我希望当有人点击列表视图中的项目时，它会将有关该选择的数据存储在共享的首选项中。当应用程序加载时，我希望它检查共享首选项，即：如果没有首选项，则转到此活动，否则转到另一个活动。我也想知道当我被发送到另一个活动时是否有一些偏好如何检索它们。这不是我第一次提出这个问题，但我认为我会问，因为我不是很清楚

继承人到目前为止我所尝试过的事情

protected void onListItemClick (ListView l, View v, int position, long id) { 
        Intent intent = new Intent(this, HomeActivity.class);
        try {
            Log.v("lc", "try1");
            JSONObject singleTeamDictionary = teamNamesArray.getJSONObject(position);

            Log.v("lc", "dictionary:" + singleTeamDictionary);

            Log.v("lc", "try2");
             ChosenTeam = (String) singleTeamDictionary.get("name");
             ChosenTeamId = (String) singleTeamDictionary.get("team_id");
             ChosenLeagueId = (String) singleTeamDictionary.get("league_id");
             ChosenDivisionID = (String) singleTeamDictionary.get("division_id");

             Log.v("lc", "try3");

             Log.v("lc", "ChosenTeam: " + ChosenTeam);
             Log.v("lc", "ChosenTeamId: " + ChosenTeamId);
             Log.v("lc", "ChosenLeagueId: " + ChosenLeagueId);
             Log.v("lc", "ChosenDivisionID: " + ChosenDivisionID);          


        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Log.v("lc", "catch");

        }

        String curPos = Integer.toString(position);
    Log.v("lc", "teamPos: " + curPos);

    SharedPreferences preferences = getSharedPreferences("prefs", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = preferences.edit();
    editor.putString("ChosenMethod", "Team");
    editor.putString("ChosenTeam", ChosenTeam);
    editor.putString("ChosenTeamId", ChosenTeamId);
    editor.putString("ChosenLeagueId", ChosenLeagueId);
    editor.putString("ChosenDivisionID", ChosenDivisionID);
    editor.commit();


        //or just use the position:
        intent.putExtra("itemIndex", curPos);
        intent.putExtra("fullData", fulldata); //or just the part you want
        startActivity(intent);
    }

然后在介绍活动中

public void checkPreferences(){


    SharedPreferences preferences = getSharedPreferences("prefs", Context.MODE_PRIVATE);

    String ChosenMethod = preferences.getString("chosenTeam", ChosenTeam);


    //String ChosenMethod = preferences.getString("ChosenMethod", null);
//getPWDFromSP()


    //SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
     //Log.v("myapp", "prefs = " + preferences);
     //String ChosenMethod = preferences.getString("ChosenMethod", chosenMethod);
     Log.v("myapp", "ChosenMethod = " + ChosenMethod);

     if (ChosenMethod != null){

         Intent intent = new Intent(TheEvoStikLeagueActivity.this,Activity.class);

     }




}


            @Override

            public void onCreate(Bundle icicle) {

                    super.onCreate(icicle);

                    setContentView(R.layout.main);
                    checkPreferences();

Answer 1

＆＃34; chosenTeam＆＃34;与＆＃34; ChosenTeam＆＃34;。

不同

Answer 2

希望此代码可以帮助您

private SharedPreferences sp;
private Editor e;

//create methods
//save method(string)
private void savePreferences(String key,String val){
    sp = getSharedPreferences("prefs", 0);
    e = sp.edit();
    e.putString(key , val);
    e.commit();
}

//get method
private String getPreferences(String key){
    sp = getSharedPreferences("prefs", 0);
    String value = sp.getString(key, "");
    return value;
}

//save String
savePreferences("yourKey","yourString");

//get Preferences
getPreferences("yourKey")

//check value saved or not
if(getPreferences("yourKey").equals(null)){
   //do something
   Log.i("value","null");
}
else{
   //do something
   Log.i("value","exists");
}

如果要保存整数或布尔值，可以编辑方法并按照您的意愿返回值。

android共享首选项实现

2 个答案: